Worried about black bits in stool

I've been going out of my mind with worry. I changed my diet about 2 weeks ago to really healthy mainly veg etc anyway i never ever look at my stool for fear of making me worry any way the last week I've checked every time I go now I can't stop worrying it's of normal colour and soft but not loose but it has had these little black spots I'd call them I worried it might be blood (I've had blood tests etc a week ago for other things all normal) ive had a closer look today ewww it seems to be seeds and some mushrooms I mean what the hell?? I've been eating spinach kale peppers courgettes etc so wondered if it's posdible rhe black bits are little bits of maybe the leafy stuffy gone dark / black through digestion? I know it's gross but I squidge it with paper and the black bits are like thinish papery so I don't think I hope it's not blood? Help anyone else have this xxx